So it's bug, or something wrong with controller bind?
from manual 737-300
Electric Trim Flaps Retracted 2.8 – 12.5 units
Electric Trim Flaps Extended 0.25 – 12.5 units
Autopilot Trim 0.25 – 14.0 units Manual Trim 0 – 17.0 units
With electric trim only, i can archieve full range trim at all condition, manual trim bechavior same as electric trim (binded as mechanical trim in x-plane)
And ZIbo ( different version 737 and limits, but same logic)
working correctly with same x-plane bind ( trim to electric trim, mechanical to trim